Display screen with a graphical user interface



FIG. 1 is a front view of a first embodiment of a display screen with a graphical user interface;

FIG. 2 is a front view of a second embodiment thereof; and,

FIG. 3 is a front view of a third embodiment thereof.

The broken lines illustrate a display screen and form no part of the claimed design. The broken lines illustrate portions of the graphical user interface and form no part of the claimed design. 

CLAIM The ornamental design for a display screen with a graphical user interface, as shown and described. 